GJB 6055-2007 Specification for 907A prefiled of military ship
1 Scope
This specification specifies the technical requirements, quality assurance requirements and delivery preparation for 907A prefiled of military ship.
This specification is applicable to the 5 and 18 gauge cast 907A bulb flat steel and 907A angle steel with a side thickness not exceeding 14mm, which are used in structures of military ship.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this specification. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this specification. However, parties to agreements based on this specification are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest editions of the normative document referred to applies.
GB 222-1984 Method of sampling steel for determination of chemical composition and permissible variations for product analysis
GB/T 223.5 Methods for chemical analysis of iron, steel and alloy - The reduced molybdosilicate spectrophotometric method for the determination of acid-soluble silicon content
GB/T 223.11 Methods for chemical analysis of iron, steel and alloy - The ammonium persulfate oxidation volumetric method for the determination of chromium content
GB/T 223.19 Methods for chemical analysis of iron steel and alloy - The neocuproine-chloroform extraction photometric method for the determination of copper content
GB/T 223.23 Methods for chemical analysis of iron, steel and alloy - The dimethylglyoxime spectrophotometric method for the determination of nickel content
GB/T 223.59 Methods for chemical analysis of iron, steel and alloy - The reduced molybdoantimonyl phosphoric acid photometric method for the determination of phosphorus content
GB/T 223.64 Methods for chemical analysis of iron, steel and alloy - The flame atomic absorption spectrometric method for the determination of manganese content
GB/T 223.68 Methods for chemical analysis of iron, steel and alloy - The potassium iodate titration method after combustion in the pipe furnace for the determination of sulfur content
GB/T 223.69 Methods for chemical analysis of iron, steel and alloy - The gas-volumetric method after combustion in the pipe furnace for the determination of carbon content
GB/T 228 Metallic materials - Tensile testing at ambient temperature
GB/T 229 Metallic materials - Charpy notch impact test
GB/T 232 Metallic materials - Bend test
GB 2101 General requirement of acceptance, packaging, marking and certification for section steel
GB/T 2975 Steel and steel products - Location and preparation of samples and test pieces for mechanical testing
GB 9787 Hot-rolled equal-leg angle steel - Dimensions, shape, weight and tolerances
GB 9788 Hot-rolled unequal-leg angle steel - Dimensions, shape, weight and tolerances
GB 9945-1988 Bulb flat steel for shipbuilding
3 Requirements
3.1 Smelting method
Oxygen converter or electric furnace smelting shall be adopted for the steel.
3.2 Chemical composition
3.2.1 Composition I (Code: 907A-I)
